Some people have worked on parts of the Paleozoic; coverage there is still rather patchy.
Status: Neogene - 20 mya - done Paleogene - 65 mya - almost done Cretaceous - 145 mya - some gaps Mesozoic - 251 mya - more gaps Paleozoic - 542 mya - very patchy The study of "sunquakes" (Wikipedia) has made it possible to test theoretical models of the Sun's internal structure, because some sunquake modes penetrate deep into the Sun's interior.
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When the Earth is closest, it has an overall "orbit summer", while when it is farthest, it has an overall "orbit winter".